Is checking the till really so much work? XD
Alerts are annoying. XD Imagine you want to buy a bunch of pets from someone and they are a merchant or someone is leaving and they're giving away all their pets so you need to buy some cheap junk pets (like 100 tu each) to do the trades. Imagine you need 20 junk pets and you get them all from one shop. That person is going to have 20 alerts all for about 2,000 tu. XD
And it would be even worse for merchants I think p; 'Oh noes! I've run out of super healing potions! I'll just buy the 65 that are in this shop' So then that person has 65 alerts.