I bought lifetime email, domain and couple other things from my webhosting provider in 2000 for 3 times the normal price for these services. They were a new company back then and probably needed some cash quick.

They are still honouring their commitment, almost half a century later and I believe it is fair.

I have no idea what was their situation at the time or whether they used the money well. But you could think about it as if you have invested a little bit of extra cash in the company and you got lifetime service from them.

The extra money I gave them probably helped them build the company and may have had at that moment the same present value as all those discounted future maintenance costs.