But I do enjoy knowing they're supported in the Character Builder, Compendium, etc., so that I can easily use info from them electronically. Makes it much easier for me to use the material in game having the electronic version, too.
My spending didn't change with regards to WotC books. I still buy just about all of them. I do spend less on 3pp stuff, since there isn't as much being released.
My RPG spending is down dramatically, but not because of the DDI. The lion's share of my spending was always on D&D books, and since we're no longer playing the latest edition that money has been freed up. That may change in future, but I doubt it.
Most of my spending is now on Pathfinder products from Paizo, but I also expect to be spending some money on Warhammer and Star Wars books this year.
You subscribe to DDI?