I basically think that the undying lands had SOME charm or power for otherwise why would Frodo say to sam-"...my wounds are too great to be healed in Middle Earth Sam.."(or something like that) perhaps old wounds could be forgotten perhaps life could be extended indefinitely i think old JRRT himself wasn't clear on this he has contradicted himself many times.
You can reply privately at my email address
sayan_mukherjee_1990@yahoo.com and we'll have a nice chat i'm just DYING to talk to some one about it!