Appears to me that it goes with the territory ! I get questions off and on about pump & petro item values.
If it appears I have no chance to purchase the item I sometimes say I don't know. Sometimes I give my opinion if I do know. You never know when it might turn into a referral to another item or items you might have a chance to purchase.
Being in the antique business for 40 plus years we all expierience tire kickers , obnoxious people. Just got to grin & bear it .

Wanted TEXACO related items & SUNOCO related items .Signs -Globes et'c. Oil Cans - Grease cans .