Why have different versions such as Standard and Pro. combine all versions and only sell one version.

Why should only one build fit everybody?
I would rather prefer to choose between different builds of a complex software. Then I can decide, what I really need and what I want to pay for.
I can't see that a developer is greedy when he wants to get paid for his work.
Nobody is forced to buy his programmes.
When I can't afford a software, I have to set priorities: shall I buy a useful programme or a game.