Two questions

1) If I change my secondary and then change it back will I get back all my skills from my original secondary?

2) whats the going rate of a max damage hammer 'caus I got four to unload and I wanna know if I can sell em for 15k a pop.

1) Yes
2) Depends on what other stats it has.

based on your firt question, I have a question to build off of that.
Do you keep the skills you earned if you went through ascention and changed your class, then change back to your original secondairy (ie. Keep primary, secondairy and thirdly)

Once you earn a skill, you can never lose it. Skills from secondaries that you aren't using are, however, removed from your skill list until you switch back to the appropriate secondary.