There's a lot of reasons, but the main one is quality. In 2008 we sold those cheap kits, but it wasn't worth it because we had to replace the ballasts of about 80% of them within a month, and then about 6 months in the bulbs would start failing. So we found a better quality kit, and while we don't sell as many, since they do cost more, it makes for much happier customers.
Could we still sell cheap kits like that? Yes- they are available for around $14 at wholesale.
But is it worth it? No. We don't want to sell the cheapest, lowest quality parts available. That's why there's eBay!
