Dont worry Brah, I have never been offended in my life. As I said before I prefer plain talking. I think everyone is entitled to their opinion.
About your questions.
Do you fly against premium planes? Absolutely!
Are all planes on the map? No, Just yours. They have it set that way as an aide to navigation.
About your concerns of B&Z versus premium planes.... Once again I have very little experience on this server but I am pretty sure my experience on other MMP flight sims will remain true here*. The ppl flying the uber planes fall into 2 categories. 1) Dweebs: guys who are trying to make up for their lack of ability by flying the "best" planes in the game. Said dweebs always end up burning up their E in short order & are then dead meat. 2) Killers... These guys are going to get you no matter what you are flying.

You might be a killer yourself & if thats the case then you know how to deal with a disparate E state. Extend... What I do is dive & extend towards friendly lines. This drags the fight into the horizontal & puts you into a nearly Co-E state. Sure you are in a defensive posture but thats better then where you were before. At least now you have a chance to maneuver for a shot when you are ready to take the fight vertical again. Also by dragging him towards friendlies he will either be prudent & break off or you might just get some help from your team mates. Which brings up another important point. DONT fly alone! You are just begging to have someone sneak up on your 6 low & smoke you! From what I saw nearly everyone is eager to link up on TS & fly together.
Regards pricing. Is what it is Brah. I feel ya though, I hate how we get nickle & dimed by these software companies but its becoming the way of the world. Many new titles have some premium content. Some have ALLOT.
I bought BoS Premium 2 weeks before it went on sale full price and was absolutely delighted with it. I was planning on getting BoM at full price as well soon as I finished the SP campaign (still havent btw) but it went on sale & able to get BoM, the C202 & P40 for 50% off I think it was. Honestly I think it was worth every penny. The depth of this sim is awesome! I am truly enjoying myself in just SP. MP is just the icing on the already staggering cake.
I have read the forum posts on ppl that are nay sayers about BoS & am here to tell you "most" of their bitches are either unfounded or unwarranted.
* when I was taxing the 110 for take off I saw 2 guys in La5's ground loop them several times until they crashed. These planes are challenging to taxi but I could just tell these guys had no clue what they were doing. They are probably used to the easy setting "fly now" that has you start in the air at altitude in SP.