Absolutely this!
I have over 10 plugins from Waves and just one instrument from Spitfire. This tells me that I spent more on Waves over the years than on Spitfire, and I still may consider to buy some more from Waves in the future but don't plan buying from Spitfire because of high prices (well unless they decide to sell BBC Strings alone for affordable price then maybe yes ). I started buying slowly into waves right after they dropped prices to $29, do have have to say more?
for $1 I will buy without even thinking about it and without any feelings, don't even have to care if it will come out great or useless later on