What you say may hold good if you owned CANDY.COM, and its related trademarks, a matching phone number like 1800-CANDY-COM. There are many people who are selling vanity tags, phone numbers, and fancy number plates. Good luck finding such a package deal for a client with fat pockets, who wants to waste zero-time doing branding.
If you to find one such candy maker, the said party will be FRANCHISEE, provided he agrees on non-exclusivity, which means you can use CANDY.COM for number of sellers and get a cut on sales, which is non-practical.
Explain me who will take the pain to lease a domain, and build SEO links on a domain, very knowing that they might have to eventually surrender the domain to somone who did nothing but regg' it in 1992? Is it his fate to have been born in 2000s, and not get CANDY.COM? If I was the candy maker, why would I let someone dictate price for a dot-COM, when I can own any gTLD and build my own marketplace?
If you even leasing the domain, you don't get much RoI. The candy maker may continue paying $x/year, because he has a long-lease. And, technically, if he makes $1bn profit or $800/mo loss, you will continue to get ONLY $x/year. May be, if you are to sell this its called FINDER-FEE ; ) The candy maker will want the domain at any cost, because he has spent a fortune in marketing the domain and not YOU.