u/Healthy-Test-7760

I have been selling consistently for about a year, just recently I have had the same buyer who will buy almost my entire store out, on different occasions. Is this suspicious?

I have consistently sold 1-2 per week to a variety of customers, until this customer who will buy 4-5 in one transaction and then come back the next day and do the same thing. Could this buyer be reselling? Do they just really like my pieces? I appreciate the business but it also seems strange for a customer to buy this many cards from one artist.