The root of the problem lies in the eBay system itself !
Ebay does not have a verification program for casual users who register to buy. The SMS, postal or Credit-card verification is required only for sellers.
I figured out that eBay imposes this 'daily message limit' on such users who are not verified.
To solve this nuisance just get yourself verified using the following link:
Create a Seller Account
Though this system is for sellers, u can handle the problem through this program.
Had ebay put some thought over it, and added compulsory verification for all users, this problem could have been solved at its root.
Thanks!