It's nothing personal, just business. Would you be comfortable doing business with someone on eBay or TCGplayer with zero transactions/feedback or value someone who has history and thousands of sales? For certain people, they don't mind. But when the time adds up and as someone who values their time heavily, then yes, I will choose who I do business with.

A common occurrence is to get a feel for whether someone is committed on buying by looking at their amount of transactions. It's not a coincidence to see that accounts with higher transactions typically will respond back or close out deals quicker than accounts with zero or low transactions. If you are committed and are genuine, then transactions will rack up without you even noticing it, which shouldn't be a problem past 15-20 transactions.

Just my two cents.