I go through this too all the time especially with the saltwater, I keep saying "do I keep it all or sell it all" mine is a 5.5 gal nano so its not a huge system by any means and I would never go larger for the fact of the prices here are just insane for anything saltwater and my love lies with my freshwater. My little tank is easy to look after but yes it does get boring to me after a while. So you are no the only one and I think certain times of the year is worse than others too.
Cheers
