It is not really recommended to invest in exchanges for the long term investment as many exchanges end up closing because it is a risky business as the market price of a lot of cryptocurrencies is going up and down.
For short term investment or you're just going to exchange some of your token exchanges work really well for some of the users, but still do not put a big amount of funds in exchanges and if you're going to put a big amount you might need to go for a popular exchange that is already trusted by a lot of users.
If you're just going for bitcoin just go for a bitcoin wallet that has a private key and store your bitcoin their for long term investment.
Well, sounds you did not get of what OP wanted. Op did not want to put his bitcoin on an exchange, however, --OP asked sincere advice if the $10k is enough capital to build his own exchange. Indeed right. The Crypto market exchange business is very profitable but if you will succeed in building and establishing on it. Just like gaining trust in the crypto community just like what Binance did. Analytically speaking, I can't compute what is the exact amount will cost but for sure it should be thousands of dollars.
Hundreds of thousands you mean because establishing nor creating one wont really just talk tens of thousands if we do base up on creating the platform plus the marketing alone
which wont really be a small amounts to talk on.Also, if you do consider such business then you should be at least knowledgeable towards it, not just
trying to dive in just because you have seen others exchange do succeed and make some real profits.It isnt easy as it sounds!.