Well ,I can not really believe that in your opinion Unity and Eshentel are equivalent engines as far as cost is concerned
Please consider that you can publish up to 10 commercial games before matching Unity price
Unity must supply something more in term of feature to justify such price gap
But what ?
According to my tests , Unity should be much faster than other popular engines but I did not test Esenthel and Ratchet claimed tha it is fast,too
I read somewhere that Esenthel is quite buggy
Did anybody test it on extensive basis ?