This is an extremely expensive price for a breed coin, just saying.

Actually, it's not. Breed Coins go for 500 ingots in the General Store. If you do the 500 bits per 1 ingot 500:1 ratio, it comes out to be 250k, theirs is a tad cheaper.

@DustyAngel exactly

You may struggle to sell. Technically their value is as you list it, but free ones are found in explore occasionally, which drops the value. Personally I've never bought them for more than 50k bits each, and I've collected over 130 of them, so there's no lack of them floating about. The most I've ever seen them go for is 100k. You may have better luck selling for ingots or exchanging it for something else valuable. for example I've done trades exchanging 4 of my breed coins for 1 Chincoteague coin. Chinoteague coins can sell for 200-250k (due to being a retired item).