I've noticed these while runite mining in f2p. They are annoying, however, they are not the worst moneymaking scheme out there. A few years ago Jagex had similar ads upon each login for f2p. They were met with much criticism and Jagex promised to never have ads like them again...
I would not welcome a f2p bxpw as I feel it devalues skills, messes the economy and promotes a "get 99 as fast as possible and don't care about others" attitude. In the hypothetical event of a f2p bxpw I would probably train smith or rc. Are there any new training methods with the lodestone update or are they just going to be used for general transportation?
With the Explorer ring 4 I am not getting the bonus xp and runes. Before I would get about 150-155 xp/invi of airs. Now with 27 essence I only get 135xp/invi. I think this is a bug and will hopefully be fixed soon. You use to have a 10% chance of gettign extra runes and you got xp for the extra runes. 4w2d