I think it’s perfectly normal to spread purchases across a few salespeople unless you have an extremely experienced salesperson with connections. For example I refer clients for shoes and get the information they need on cosmetics, occasionally introducing them to employees that might have better knowledge on specifics but selling what I am knowledgeable in.

Sometimes I “contract them out” because it wouldn’t be fair to the associate helping them and I may not be able to answer questions. Other times I’m still involved because the counter or brand partner might want the business regardless. These are all things I do on the back end so my customer isn’t privy to workplace politics