There seem to be many facets to this problem in my case.
1 - Usually, if I'm really inspired, I am less inclined to be on the look out for new things or switching DAWs. Likewise, I'm less likely to fuss around with a dozen EQ's or compressors.
2 - The less time I spend on this particular forum, the better. :P
3 - Hardware. I've noticed at some point that I was kind of compensating by buying plug-in after plug-in, wasting hundreds and even thousands $ when a single reasonably priced outboard EQ, a preamp or a new pick up for one of my guitars would make a much more radical difference. Often, instant availability and the illusion of saving $ made the software option more appealing - but that was a temporary fix and pretty soon, I'd find myself in the same position.
TBH, I can't remember what was the last plug-in I bought. Must have been sometime last year.