In defence of the OP I do not really think this is a troll thread, just because his/her opinion differs from others doesn't makes his ears pointy
In reference to the OP I couldn't disagree more, your suggestions are way too OP IMO.
In regards to the American UA, it has changed post release. Originally America had a river bias (the only civ to have one). The plot buying option was designed to allow purchasing good tiles (of which their should be penty given the river start) quickly and cheaply. But this is not the best part of the UA. The sight bonus is awsome. Early game exploration is completed quickly and safely (settlers generally do not need escorts if used right) through that bonus. Barb spawn busting is easy to accomplish, not to mention all 3 ranged units being usefull with out hills or spotters. On top of that the Minuteman has been buffed several times since release and is extremely potent now. The bombers are just the icing on the cake, given bombers are strong anyway.
As with any UA you have to leverage it to really use it. If you do not buy plots, then why not ? Why don't you want that luxury that you will have to wait 20 turns for, why don't you want to steal that plot from a competing CS/Civ. Why don't you use the sight bonus for safe settling, ranged units, scouting enemy cities etc. Why not grab the Wonder that reduces plot buying even further and have all new cities (settled or conquered) best tiles available from the get go ? If your playstyle is highly macro managed, quick, direct etc then they may not be the Civ for you as I believe America is a more stretgically minded Civ. This does not mean that the Civ UA is useless, especially when considered in tandem with their UU's.
BTW I purchase tiles everytime I play.