I have never worked with a turn key company nor bought out of state but I do intend to buy out of state.
From my research, most turn key companies buy distressed properties, rehab and sell to make a profit. Like any seller, the more they sell for the bigger their profit so it is in their interest to sell at market value. Hopefully you get a great company in it for the long haul, trying to build a excellent reputation and get repeat customers/referrals. That company will buy carefully in the good areas, sell at a reasonable price and carefully screen excellent tenants. There are a lot of ways to take advantage of out of state people and new investors though. Tell them the AVR is high and comp it to properties it is not really comparable too, buy it for dirt in a war zone and tell them its a great neighborhood, subsidize the rent so it looks like it commands a high rent, lipstick rehab, etc.
If you are looking to own a investment property or two then you are best off with researching an excellent turnkey company and buying from them.
If you plan on real estate being your thing and owning a lot of property you should research a market and build a team. This is a much bigger investment of time but the rewards are much higher too. You can find that distressed property, rehab it and have equity right away, refinance and pull that equity out for new acquisitions. Ultimately end up with more properties and feel more secure because you know your market.