That depends on perspective. If you are a professional programmer using JetBrains tools as daily drivers then I think think £100 over the InteliJ price is pretty reasonable to get access to their entire library of tools.

Consultants make at £400 day here, dotnet devs usually more.

If you are a hobbiest, it's cheaper.

And the costs decrease each year.

If you are saying £100, then it sounds like it would offer you money for value, so it's probably not for you.