Wait, why on earth would/should they "challenge" someone who's paying for multiple hotels? Maybe they should only *credit* one according to their rules (it's not clear), but it's not against the rules to book them and pay for them. And of course it isn't, because it would be *insane* to turn away or discourage in the slightest way that kind of business from someone.
Agreed. And there is nothing stopping you from doing that. Even if your MR account is locked out, you can still book a room either online or on the phone, you just won't be able to link it to your account to get MR credit for it. Yes, it's more inconvenient, but doable. And like I said, maybe they should have a means to only lock out point access and not total account access.