Occasionally, it's nice to compensate people for producing something that others value. This has a couple of benefits, one of which is that same person might continue to produce interesting things.
I have no problem with paying people for their work, I just don't believe kickstarter is the appropriate platform for selling already completed software. (And neither does kickstarter, unless they've changed their goals recently).
Patreon would be more appropriate as an after-the-fact compensation.