I’ve been joking for years about getting into the cob export business. Buy some cheap, green cobs on Dragon Driving, ship 'em over, sell 'em for $$$$$$$$.
In all seriousness, they are incredibly popular in the UK and Ireland as ammy-friendly low level all-rounders. Don’t know about Ireland because I’m not there, but in the UK, the market went nuts and you could spend an easy £10,000 on a safe, friendly cob who could jump a bit, hack safely, and do a bit of dressage.
Of course, young/green will be cheaper but as with all horses, anyone producing cobs aimed at HOYS or such things will be far more expensive than people who let whatever breed whatever in a bog,
The other thing with cobs is that maintaining the feather is. a. b1tch. There are many cobs on my livery yard (in Scotland) due to being the QH of the British Isles - plentiful and often ammy-friendly. Almost everyone I know who owns one has a nightmare with the feathers. They have feather mites, mallendars, sallendars, and those conditions can be extremely uncomfortable for the horse. Very few cobs at my yard have their full feather. Most owners shave it off to make their lives and their horse’s lives easier.
When I was looking for a riding horse a couple years ago, I initially wanted a cob but then started paying attention to the trials and tribulations my friends were going through with their cobs’ legs. I changed my mind and did not buy a cob.
That said, some cobs are sportier and have quite minimalist feather. You probably won’t have as many problems with those. It’s the heavily-feathered ones prone to the mallendars/sallendars/feather mites.