Infestation is just not worth using anymore (was it ever), the amount of troops i have lost in my entire game/gained back is just completely out of scale, you should rename the infest system, to (waste you're troops), their is no strategy just loses with very minimal returns, what a waste of time it was playing this game.

You should read some of the old guides here on the forum.  Infests have a tax (around 3%), so on average you'll get 97% of the troops you send in back, the other 3% are lost.  This means if you do them enough you will always lose.  There is no secret strategy that will let you always win more than you lose from infests, although they are still useful for some things (like trading one troop type for another).  

so explain why after almost 5 years of playing i have only receive a couple of decent payouts and consistently loose 98 percent of my troops and gain 2 percent back, is it just the (strategy) of plarium to make people buy more?, because the infestation system is definitely NOT how you describe it, i am now a level 86 and just see this not worth pursuing anymore.

when one spends so much on the game as you can very well see, and to have less than 1m in O and D is a smack in the face, it is extortion at best, this is after 7 years or loyalty.....

Oh, you're on the facebook version.  I don't know anything about that, this forum is for the plarium.com version of the game.  If infests work the same on both versions then the more you play them the more you will lose.  Do you keep any kind of logs on what infests you hit and how many troops you lost on each one / what you won back?