Purchase question.

It's time to renew. Question, thru the renew link the price is more than double what i paid for the program initialy. That just don't sit well with me. i can however buy it straight out for what i bought my current for. if i purchase the standalone (skipping high priced rewewel) i assume i will get a new key. Can that be entered into my current at that point or will i have to reinstall entire program. 
 
Thanks
 
Edit - By the way, I bought current version at webroot for $29.99 yet the renewel is showing me $70 plus. I can purchase again at webroot for $29.00 as i just added it to my cart yet im concerned there would be a license issue or a renewel issue plugging in new code to my current. My current keycode is being used on 5 systems so im confused on how to handle this. Anyhelp is appreciated.
 
Thanks