Did you even read the proposal?

How many more things can you add to keychain beyond this point that it would warrant doubling its funding?

A lot. We basically get requests for new features, UX improvement and other enhancements all the time. Both by users and dApps. Just the past week we have implemented Hive Engine (will be released soon) and a new request called signTx.
Onboarding is a real problem for now and we want to improve Keychain to make it a part of the process, with the ability to directly send keys to the extension when an account is created. We also need to get ready for SMTs and that will be a lot of work.
For the extension itself we only require the same funding (100 HBD) to keep the same pace of development.

The rest will go towards creating from scratch a brand new mobile App that will enable mobile Hive dApps to make requests to Keychain the same way that it currently works on browsers.

Both projects will always remain opensource and you will be able to check that work is being done.

Im really starting to get royally pissed at this greed going rampant!

I hope the above points will convince you. 6k (at best) for development, design and translations on 2 projects is really a bare minimum for what we want to realize.
I do realize that we should probably have put the the extension work and the mobile App work in 2 different proposals for more clarity though.