I am ok with DLCs, if it is a huge part pack and fundamentally changes KSP. There are some great suggestions here that I would pay for. No mod has successfully added submarine parts that function like real subs, and an official boat part pack would be awesome. The problem with DLC and a game that can be modded very easily is that if Squad created a DLC, there is probably already a mod for that. I would not pay for an EVE Online DLC, but would pay for a KSP DLC. This is getting a little too extreme. If you don't like 'em, don't buy 'em.