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It's more that the estate agent gets in those who wouldn't necessarily have considered it due to location, size, price, etc.
Obviously it's hard to tell how many of those will end up being serious and how many just go along to have a look anyway. I'd guess the best bet are those looking at a different area.
I know I viewed places that I wouldn't have looked at (particularly with the faff of booking with an online one) because the estate agent suggested them.
I genuinely feel the cheap / free to sell agents are only good for
You can't square the circle of 'we want the most money for this with the least possible expense'
If the place has a parking space that should be included in the listing however, regardless of what you do.