I think they're a cool idea for the gametypes alone, even if I doubt I'll do much wagering. Fortunately, it looks like you can bet very low amounts per game if you want so that should work.

I used to be a big fan of the CSS gungame mods so I'm excited for that. Not too interested in the gambling concept itself. 

The lower your rank is, I believe the bets are much less. So you want to start early in wager matches, I think.

I play wager matches purely because the gametypes are awesome. Cash doesn't seem to be too useful, unless you are wanting to try out another gun or something. Even still, it doesn't take long to get the classes you want, so fawning over the money isn't needed. 
 
Well, if you want EVERYTHING unlocked then yeah, go for it.. I guess!