We count a tier 1 bundling with DRM-free copies provided as being bundled twice, since they tend to get flooded in GAs and trades.
We haven't thus far made special considerations for Monthly bundling, since per-game that's about on par with many BTAs.

We try to ask for games with under 3 bundlings (Galak technically coming in at 3), though 5 is our main cutoff (which is why ROM is straight out).
If there's even a small handful of group wishlists for the game (8 is generally what we expect at 3-4 bundlings, with 4-5 wishlists for 2 or fewer bundlings), we tend to go off bundle amount alone (and if there's a ton of wishlists, we more or less ignore bundle count altogether), but when there's so few wishlists it starts to come across as "giving away a game that noone wants, and you can't really get rid of easily anyway". That's not to say YOU, or anyone currently in the group has that sentiment, it's that given some of last year's participants, we've structured things a bit more strictly this year, to better protect participants.

We don't want to try and force anyone to buy anything (though there's some great DRM-free-included offers that I listed here, if you want a good CV return (not sure about their region-locking, though)), but at the same time, we do want to try and have giveaways listed that event participants are actually somewhat interested in (regardless of what their bundling/sale rate may be).
In other words, it's not a matter of expecting monetary investment, but of trying to make sure none of the (primary submissions) feel like lackluster throw-ins [ie, "bundle junk"].

It's fine to throw in a tier-1 bundled game, so long as there's good interest in it, and there's several factors we try to review per game, above what I've listed. So if you can find anything you think looks good, it'll probably end up working; That said, Galak is a bit borderline, so if you say that's all you can provide, we'll for sure take you on your word. :)