Current cost seems to be about 67€/mo (https://kbin.social/m/kbinMeta/t/9965/kbin-Just-Reddit-Things-update#entry-comment-43440).
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The cost last month for a few hundred users will be 67/month.
I suspect you could spend several thousand this month and still not keep up with demand.
It's a virtuous circle, the faster it is the more people come.
For 6k users last month it cost €16/m
For 121k users at the moment (according to the website statistics posted here) it will cost €67/m, though I think we can all agree the system is a bit under provisioned at present, despite using the largest instance provided by the VPS (edit: not entirely true, see @ajar7 's reply below).
Assuming the truth is somewhere in between (I'm assuming the current state is ~30% under provisioned), and horizontal scaling will be both necessary and somewhat less efficient (I'm assuming ~40% less efficient than vertical scaling)
It comes to something like €0.001 per month per user.
At Wikipedia they get around 40,000 gifts of on average $15. They get something like 5.1B unique visits per month. That's roughly $0.00012 per visit.
The comparison seems to imply we need to get something like 10x the user/donor engagement of Wikipedia, which is very sobering.
https://www.hetzner.com/de/cloud has CCX41 and higher (under Dedicated vCPU tab), but that bumps the price tag over €180/mo. One needs to file a support request to up the vCPU limits above the CCX32 plan.
Gotcha. Thanks for the additional details, that makes a ton more sense.