Welcome to Gaia! ::

During the summer, you need to save your gold, because you need to hoard. During summer you buy everything! There are roughly like 37.5k users on right now. By right now I mean not during summer. During the peak hours, from like 4-9, there are about 40k online. During the summer, from about 7am-11pm, there are close to 120-130k users online. So that increases the supply of almost every item on the market place, which drastically lowers the prices, because you could potentially have like 5000 people who got nitemare sashes, who are willing to sell them. With 5000 more sashes on the market, the price plummets. I got this wind security blanket, which was an October mc like 5 years ago, for 290k during summer, it's now worth about 700k, because with 3-4x the amount of people, if (this is a made up statistic) 1 of every 100 people has one, and there are 40k people on, then there are 400 blankets, but if there are 140k people on, there are 1400 people with blankets. This is why everything drasticaly deflates. Any item is good to buy in the summer. Kitty slippers (my currnt hoard) might hit the 7.5k they were worth last summer. If you buy 1000 at 7.5k, and they up to say, 37.5k during the regular year, you make 30k off each pair, and with 1000 of them, you make 3 mil. Look at the items that are hot now for ideas. Also, winter items are very cheap during summer, so buy a lot, because right after summer, comes winter, and the seasonal inflation occurs (which can also happen in any other season, but the holidays are what make winter inflation more dramatic).  

That's what I think I'm gonna do. Something involving economics. Also thank you, and your welcome.