First and foremost, do you clean your router bits? Router bits get gunky just like table saw blades; a cleaning can make a big difference. Remember to remove the bearing before you clean the bit.
With care, you can re-sharpen router bits to extend the useful life of the bit. Use a diamond stone on the flat side of the carbide only. If the router bit has more than one cutter (most do), be careful to sharpen each one the same amount to maintain the match between them. Re-sharpening may not be as good as new bits, but it may get you a little more use from them.
Rockler has an unconditional guarantee on their router bits. They will say that it doesn't mean buy one and they will replace the router bit for life, but "unconditional" means "no conditions" to me. If you feel that it does not deliver a satisfactory amount of useful life, they should replace it, right? (In my opinion, Rockler-branded router bits are better than the average cheap bit, but slightly inferior to Freud.)
I met the Freud representative when I was shopping at a woodworking store one day. Of course he was enthusiastic about his company's products over the competition. One claim I heard is that Freud makes its own carbide. He said that Freud's carbide is superior to the third-party carbide that others buy and use. My own experience with Freud bits is that they are neither worse nor better than other common brands.
Whiteside and Amana router bits have a reputation for being better quality and more durable. Certainly they are priced higher than the competition. I admit it, I buy Whiteside bits when I am working on a "special" project and want the best, or for common bits that get a lot of use.
Some things to think about, anyway. I hope it helps.