Philip has the right idea. Be very careful which effects you invest in though. Some of them are so saturated, they will likely never sell.
Yeah. The Strange Massed Flies Critcloak I recently sold took way too long to sell. Many people rejected trade offers because the effect was terrible.
Also, NEVER BUY LOW TIER HEAVY UNUSUALS.
Unusuals you should avoid:
- Massed Flies
- Nuts and bolts
- Overclocked/Memory Leak (undesirable effects, but still decent)
- Orbiting planets (Ugly as hell)
- ANY UNUSUAL TAUNT
- Unusual weapons (unless it has a solid price/tier)