I have just relived every great idea I've had for the last 15 years.
When I was 20, I decided I wanted to be crafty and bought hundreds of dollars worth stamps, pads, stickers, embossing supplies, paper sets etc etc etc ad naseum then promptly made 2 cards, one picture frame and a Christmas ornament before I decided I didn't have the time or the money to continue. I stuck it all in cheap plastic containers and stored it away for a better time.
Then when I was 23, a close friend and I decided we were going to open a gift shop and were making gift baskets and selling them. I bought hundreds of baskets, miniature stuffed animals, and gift bows, sold a few dozen, made a nice profit for about 3 months and then started fighting with said friend and we chucked the idea. The remaining items were bagged up and stuffed into a closet.
Then when I was 26 and lucky bamboo was all the rage and I found a wholesaler, bought hundreds of vases and gravel and plants... turned a nice profit, but then saturated my market (seriously, there are now 5' tall bamboo plants on every 4th desk at work) and gave it all up. I eventually killed the remaining plants (PSA: a brown thumb should not sell plants), wrapped the vases in newspaper, packed them into boxes and shoved them onto a shelf.
When I bought my house, ALL of these great ideas then got packed up and stuck on a storage shelf and proceeded to collect dust for the next 5 years.
And now? All of it is in my garage, piled only moderately neatly on tables with a brightly covered tags on it waiting for some other hoarder to come along and pay 25 or 50 cents for it and GET IT THE HELL OUT OF MY HOUSE.
We need it all gone to make room for the BRILLIANT idea I had when I was 29. That idea took nearly three years to come to fruition, but I must say, when you finally have the right idea, it could never be confined to a shelf.