By donating you are directly funding the future of TeraPS. Money from donations goes to VPS and Wehosting costs. Additionally, you will help advertise TeraPS, too, which will lead to a larger and more active community!
You receive rewards in game and on forums for donating any amount over $5 USD. Two rewards that all amounts have in common is a name colour change (Yellow 5$ in forums) and a donators badge (showing the amount donated) under your avatar,also ingame rank and TeraPS Bucks!