-Is it worth it suiciding the hero, to revive him by paying full revival price, just so you can keep on levelling him up/do adventures?
Depends a bit on your willingness to either spend real cash or sarcrifice other usefull items.
Personally, as a mediocre gold user I tend to sell high quality weapons and weapons with little use for me (for instance phalanx spear if i went off) (also buy them at some point when they are cheaper or in lower quality) and with the earned silver I buy armor and helmet with regeneration and damage mitigation on it. They are pretty expensive early on, but again, lower quality (and shopping at night/or veeeeery early into the server) helps. With that and some points in STR you can pretty much do every adventure ASAP without dying, saving the res for revive and for your hero not producing while dead.
Also: the first revive is 80% cheaper and faster, this can be used in the early levels to have him up sooner (tho ofc the later in levels its getting used, the more you actually save)