Whats wrong with researching a product before you make a purchase. I do it all the time, whether its on-line or in a store.
Purchasing on-line and you are usually only left with what is on offer, going into a store and you may well have someone providing some very fair advice, and who might negotiate a better deal for you.
In fact I have even taken print-outs of on-line deals, and ask the store if they price-match. I have never yet had a refusal, because most places will price-match or give additional items to settle a deal. The main stumbling block I would assume, is that some people are very reluctant in asking, because they get rather embarrassed, or think that is not the done thing!.