I think what this thread illustrates is that there are a variety of people out there who are your potential market and some you will never be able to reach. Made up percentages, but I think it looks a bit like this:
5% will turn down a house for too many bottles of shampoo in the shower. Presumably only interested in show-homes/new builds. You can probably afford to write off this fraction of the market.
15 % with a reasoned tick-list (no on-street parking, for eg, large enough garden) which they will not compromise on and have the money to know they don't need to compromise on. You can't reach this fraction - again write them off.
20% who simply lack the visual imagination to see past a bit of clutter. You can reach these if you're prepared to put in a bit of work, and it's probably worth doing in order to boost your chances of finding the right buyer at the right price.
20% who don't mind a bit of clutter, but will be put off by something like a bad bathroom. Depends on how much money you're prepared to spend - but the general rule of thumb from estate agents is that you don't put a new bathroom/kitchen in simply to sell, because you will not get the money back. So if your kitchen is dated, simply on financial grounds you may have to write this fraction off - but it's swings and roundabouts. Maybe accept you don't want to spend 15K on a new kitchen which will only make the house marginally more likely to sell, but accept that you maybe need to put the house on for 8K less than the one down the street which has just had its kitchen done.
15% who don't mind major decorative renovations, in fact the "clean slate" aspect quite appeals (I was in this category when I was young and full of energy) but will expect it to be priced accordingly. If I'm putting in a new kitchen and bathroom, I expect the house to be cheaper by roughly that amount than a comparable house in the same area with everything done perfectly.
5% who don't mind major structural work but will be expecting it at a knock down price.
People in the last two categories are probably going to be put off by a perfect house - they're looking for a bargain!
Any house will sell at the right price.
No house will ever appeal to 100% of the market - the bargain hunters will assume the perfect "show home" isn't for them, people looking for "move-in-ready" won't even bother looking at a fixer-upper, people with the money to be able to ask for an extensive tick list won't look at a house that doesn't meet that tick list.
But you can "tinker round the edges" - decluttering, lick of pain on the obviously shabby bits etc. - to increase the percentage of people you will get through the door.