i think its called 'buyer brain explosion'

the buyer becomes so excited apon buying an item their brains litteraly explode. for the next 24 hours they find themselves walking in circles, froffing at the mouth and doing hand stands.

other symptoms are as you described, sending out messages then ignoring the answers. buying more items. paying imediately without waiting for post reductions.

there is no cure however it seems to wear off eventually and some sufferers go into denial, messaging sellers with angry messages about why they paid so much more than they should have.

the poor seller is left trying to sort the whole mess out, sometimes causing a 'seller brain explosion'

its a vicious circle, take a bex and have a good lie down is best at this point.