IM is really addictive, yes, but I can manage my spendings.
But yeah, I've bought some tools and never used. For example, I bought "PLR Poster", a tool where I can upload a bulk of files containing articles and auto-schedule in my WordPress blogs easily. PLR Poster was a good acquisition but, after buying, I finished buying another tool where I can do it too, with a good text editor too.
I bought some ebooks and, when i started to read, I found out I knew more than those ebooks. It's more common than you can imagine.
But, as earlier you learn to control your impulse and only acquire something having sure it fits your business model, better for you.