Hi Satish !
Wordpress as a blogging platform is very well established. There are plugins and themes galore, and it's relatively easy to customise. The support base is huge and you'll find loads of people who would be glad to help with any queries.
I'm afraid I can't answer the part about AdSense revenues, but before you decide on shelling out the $60, I suggest you take a deep look at your site's statistics and what you're aiming to get from the switch. If you're unsure, I suggest getting an account at http://www.wordpress.com for free to play around with the interface and see if it's what you're looking for.
If your provider Netfirms is charging you $60 merely to install WP, and you'd like to save the cash, I suggest attempting to install WP yourself. It's fairly straightforward and as long as you (your host) meets the minimum requirements, the install ought to be hassle-free.
Installation Guide
you can still use WordPress by requesting the WordPress Install4Free team do the installation for you for free