It seems to me that at least half of the parts that installers sell are to people who are installing them on their own, you also then get something that the installer feels is of a high enough quality that they are willing to recommend it to people and some installers also service equipment, like when my parents had their inverter high by lightening, their home owners insurance covered it but they still had to get it fixed, took it to our friendly solar installers service shop, they replaced parts, tested it and sent me on my way.
Installers are also better at getting tips on equipment to avoid then any online review, as they have looked at the broken parts first hand and can tell if it was installed wrong, or if it really was equipment error.
Also local installers are often cheaper for buying PV panels as they tend to buy in bulk and don't have to charge you as much shipping.
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