- Pay 300 MC and 1,000,000 C-Bills to put a bounty on someone's head. Their name has a skull icon next to it for the next week. Player that kills them the most collects the C-Bills.
- Start selling mechs in 2-for-1 combo packs. Sell the less popular variants with the popular ones for the price of the popular mech + a mech bay. If they just sell the off variant, well you at least sold them a mech bay. If they keep it you might have sold an extra camo.
- If you're on premium time you can challenge another team to an (unscored/unpaid) head-to-head grudge match. Otherwise there's a small MC charge.
- Pay 300 MC to peek at another player's stats for a day. Hey, you can be elitist. It just costs money.
So some dude mocked your KDR on the forums. He just paid real money to see it. Who's the real winner here?
- Put billboards up in River City (day) and charge for Merc units to advertise/recruit on them.
- Alternate computer voice packs (yeah, I know that one probably isn't cost effective)
Oh, and for the love of Blake, release a map editor. Or just give the specs and file format required. This crazy *** community been making A+ quality maps for free since the days of MW2:Mercs. They crazy. Valve know it's a heck of a lot faster to QA their top 5 picks for maps than to build 5 new maps.