I wish I had some sage advice as to how to get over gear lust, but all I can say is that if you can overcome this one obstacle in your music creation, you will be far better off.
I can’t tell you the amount of time I have wasted trying to research a piece of gear to get into my setup which I felt would revolutionize my sound or workflow, or streamline the process of making music, or salvage recordings I thought useless, or myriad other “problems” I think I have.
Unfortunately it all comes down to a culture of consumption. It surrounds us all day everyday. All advertising preys on the insecurities of us. “If I just had a Motif my keyboard parts would sound better!” or “Wow that artist is way more popular than I am, and look at all that sweet gear they have in their studio!” (I am talking about deadmau5 here, that guy has all the toys)
All I can say is that you will waste time and money buying gear and being disappointed in it. You will sell it because it didn’t have feature “x”, then buy other gear with feature “x” and be disappointed, then sell it because it doesn’t have feature “y”. Ad infinitum…
Trust me, having the newest sound library of violins might make your production a little better, but it might also take you a few weeks of mastering how to “play” that library to get the nuances out of it. Do you want to invest that time? It is the law of diminishing returns.
If I could do it all again, I would have invested in the best gear I could afford years ago, then never looked back. If I had an MPC, or ASR10, or a Prophet or anything like that, I would still have and use it. The newest stuff is all a flash in the pan, gone in a second sort of product. Especially when it is tied to a computer to edit or backup or what-have-you. (I am looking at the Mopho by Dave Smith)
So again, my advice is to focus on really learning the gear you have and mastering that. As RJD2 said on a Gearslutz post “Art trumps gear 100% of the time.” Very often gear does not limit us.
The one retort I have to the entire gear lust culture is that sometimes you get a new piece of gear that just inspires you. It is hard to discount that feeling when you get a new synth and you spend hours immersed in sound design, then come up with a new riff or song. Like I said, I don’t have sage advice, as I am conflicted about this topic. In theory, to be a great musician I should be able to grab any instrument and make great music. That is easier said than done though.