It is not really considered good manners to do so, unless a poster's bidding history directly pertains to their post.
For example, if a Poster claims they are flat broke,lost their job, have a sick dog and can't afford to pay for an auction bid, yet their bidding history says other wise.
Then it is open season on one's bidding history
You could try asking the poster via Ebay Message system Off the board.
Some Ebayers may take offence, will not answer, could even report you for spam.
Then some posters could care less and would be happy to give their opinion of the item.

Big Azzz and Proud! Fill Her Up!
Proud Mom