Payment should fit the responsibilites you're taking so must do the appreciation on payer's side.
yep.
I get, a bunch of things: if I feel like a piece in the scheme, wheter I can develop my skills, the daily contact with people surrounding me and lot of other little things that make my life and future look better inside the working process.
This is the value-added stuff employers need to think about i order to get and keep the valuable employees.
If they left me go is because at some point they didn't valued me enough so I won't in any case value them back more, why should I?.
Exactly. As I said above, it is like a relationship - if a person doesn't want to be with me, that is fine - I wish them all the best and move on.
Even in a self-employment situation a team spirit must be present. That spirit will grow if there's trust and integrity involved (as you stated in your text) but the main source comes from the top, you in case it's your business.
I think there's a big lack of both virtues but that doesn't necesarily means a business won't success. It's a paradoxical reallity but also historical to be accurate. The "team" word seems to appear everywhere withing the job environments but few companies have actual groups that behave like should. Competitiveness seems to be camping freely and who is your partner (team mate) today may convert himself in your "killer" if possible...sad.