This explains a lot! In addition, I am sorry, with the plethora of videos, reviews and data available online, so much can be learned without stepping foot into a shop. Even forums like this one help a lot. Personally, I will always research online and know what I am looking at so when on the few occasions I walk into a shop I can spot good deals! In any case, I mostly buy online.
Disclaimer - this is my own opinion and not necessarily for the intended use by others!