It might feel to the vendor like when your insurance company tell you your renewal is £700. You try somewhere else and get a better deal, say £500. You ring your current insurers and say you're not renewing as you've got it cheaper elsewhere. They then start pulling better offers out the hat, say £480. By this stage you're just pissed off with them and ask yourself why they didn't offer you their best deal in the first place if they wanted your custom. It sticks in your throat to accept it so you go with the £500 insurance. You took a gamble and it didn't pay off.
I think sometimes in Location x 3 Kirsty and Phil will say if there's a lot of interest you need to stretch yourself to your best offer at the outset, if you really want it. We did for our current home, with which I deliberately did not fall in love as there was loads of interest. I didn't even look that closely and didn't even notice certain features still final visit day before we moved in.
Some people choose to buyers on what might seem to you like crazy criteria, it helps if you click if you meet at viewing stage, after you've been through a couple of sales/purchases and know how tricky it can get you'll want buyers that seem capable, honest and keen to get on with it.
Other crazy criteria I have known - will take care of the garden that has been lovingly tended for years and not cut trees down and pave it over, will continue feeding the birds, will keep an eye on the elderly neighbor that the vendors are fond of, will use the train and not add to the crazy village car parking problem, will not piss off the neighbours, with whom the vendors are close friends and would like it to stay that way after they move, will be patient as the vendors find and buy their own dream family home.
Good luck with it and never believe it's yours until the keys are in your hands.