Donating is always fine but it's not like a deal where you pay to buy something
The rented server used atm itself is ok (sure everything can be upgraded) .
afaik Loftar had plans to buy own hardware and set up at a colocation in Stockholm to have alltime personal access. I don't have a clue how much progress is about that. For hardware + colocation/traffic fee they'd prolly could use every donation.
In my imagination it goes like this: coding new (recode) while W6 still runs with little maintanance only, getting colocation setup with new server, installing OS and setting it up, run tests, get the new code on it, run it and test - if no flaws = W7
but that will sure take some time - so don't expect it to happen in the very near future...