Shares of Zynga (ZNGA) popped by as much as 11% Monday after Wunderlich Securities analyst Blake Harper suggested it might make sense for Yahoo! (NASDAQ: YHOO) to acquire the social game maker.

To be sure, the rumor mill has been buzzing ever since word got out last week that Jackie Reses (Yahoo's head of mergers and acquisitions) let it slip to employees that the company was working on two "significant" acquisitions. 

Unfortunately for the Zynga bulls, I just don't see a buyout happening for myriad reasons. For the sake of brevity, however, here are two of the biggest things that would make Yahoo! think twice about entering the social gaming space via Zynga.

Less-than-stellar management
Sure enough, shares of Zynga lost ground Tuesday after analysts at Macquarie Capital poured cold water on the buyout thesis, saying "We believe that Zynga is unlikely to be acquired anytime soon, as we don't believe that Mark Pincus wants to sell at this time."  

Yep, that's the same Mark Pincus named The Motley Fool's Worst CEO of the Year in 2012. Still, even if Yahoo! actually wanted to buy his company, would you blame him for not wanting to sell? After all, Yahoo! CEO Marissa Mayer has been taking flak this week for her notoriously stringent hiring standards and, given Pincus' painful past transgressions, something tells me any Zynga buyout scenario likely wouldn't involve keeping him around.

Then again, perhaps that wouldn't be much of an issue anyway, since Pincus hasn't shown much restraint with regard to dumping his own personal stake in his company. Nonetheless, his persistent demonstrations of a lack of faith in Zynga don't bode well for its prospects, especially when we remember eight of its high-profile executives voluntarily packed their bags last year between August and September.

All things considered, none of this is particularly encouraging to potential suitors.

Stronger, cheaper acquirees
With Zynga's market capitalization at just under $3 billion, Yahoo!'s $4 billion in cash and liquidity (as of the end of 2012) would require a good amount of their dry powder to acquire the company outright. Even accounting for Zynga's own veritable cash pile of $1.3 billion, the fact remains Zynga is still barely profitable. In addition, I'm hardly alone in believing its business is simply unsustainable over the long run.

Besides, Harper's mention of Zynga seemed more of an afterthought following more serious speculation about why it might make sense for Yahoo! to purchase smaller companies like restaurant reservation specialist OpenTable or review provider Yelp -- the respective market caps of which are significantly lower ($1.4 billion and $1.5 billion).

In addition, the functions of Yelp and OpenTable also appear to more closely align with Mayer's stated goals of focusing on making Yahoo! an integral part in consumers' "daily habits," including things like searching the Internet, checking finance, and handling email. If Mayer had any significant interest in expanding Yahoo's gaming presence, you'd think she would have made more notable mentions of it to date (that is, unless they're trying to keep a significant gaming acquisition quiet).

On one hand, however, I'm still not entirely convinced that Yelp's ad-reliant business is built to last, especially considering its own poor fourth-quarter earnings report from last month.

On the other hand, at least OpenTable is not only cash-flow positive from operations, but also has actual trailing earnings to report -- even if it is currently trading for nearly 60 times those earnings. In addition, considering OpenTable's return on invested capital of 14.3%, the company has continuously demonstrated an enviable knack for creating shareholder value by reinvesting capital in its business. With this in mind, I should think OpenTable is the most attractive buyout candidate of the bunch.

What now?
Even given Zynga's recent online gambling aspirations, I still can't picture a scenario where the company can survive (much less thrive) over the long term. Let it suffice to say, then, it'd be a hard sell to convince me Zynga is a bona fide acquisition target.