In defense of handling daily, I don't see an issue with it if a reptile is happily doing so. As long as it isn't kept out for too long at any one time, if it is happy to come out, then I think it should. The issue here is attitude towards handling.
Teamls - You seem to think the pet shop keeping the monitors out on shoulders etc is because it's "the done thing," well, hate to break it to you champ, A PET SHOP IS A BUSINESS > if the monitors were locked away under key and they didn't handle them at all, had basking temps of 60 degrees (which would make the monitors more active than they are and LOTS more agro) I doubt as many people would purchase. See the math here?
Everyone has a different opinion on handling reptiles, one extreme is handling for several hours a day and the other end is never handling, so I don't think there is an issue with that. Each to their own - as long as the animal eats and behaves normally (and by normal I mean NATIVELY normal) I dont' feel there is an issue, unless the reptile is being used as an accessory (which I believe is going to be the case here, the whole reference to shoulder riding and watching tv is a dead give away - the monitor probly seeks people due to their body temperature, not the desire to be friendly)