I buy my MKs @ 4-5k + nades @ 1.5k
Not sure what you are complaining about. Even when it's 12k, who cares. Don't become a rebel if you are worried about wasting money. You said it yourself, you have all these houses, why not just fill them up with guns?
Or don't die as much.
Or play with friends who will revive you.
-1 Keep gun prices the same.