Fortunately for me I noticed it before buying. Even so, had there been no GOTY edition I would've gladly paid $32 for the whole thing - but $20 is an absolute steal IMO.

Maybe gog will credit you the difference as long as you are willing to keep the extra money on their service to spend at a later date.

Also,

Those who have bought the original game, receive GOTY for free.
I don't know if it works after the release of GOTY for shopping, but I got the game in 2015, and when GOTY was announced I received it in my library.

IF,

Those who don't have the original, and found about the game only month or less ago.
Buy the GOTY without the original. GOTY doesn't require the original to function.

MONEY BACK GUARANTEE works for 30-days.

gogwitcher300

I highly doubt that since I do remember how owners of the normal game were trying to convince CDPR to finally offer an upgrade option to GOTY or (for users of base game and both expansions) give the option to get GOTY for free. When GOTY was announced and not even after it was released this option was not available. It took them quite a while until the offer was made.

In fact the offer was made in November 2016 as you can see here
https://www.gog.com/forum/general/upgrade_to_the_witcher_3_wild_hunt_game_of_the_year_edition_11c50/page1 Careful though: money back guarantee for 30 days only applies if the game is not working. (Of course you can always withdraw from contract as long as the game has not been downloaded).

I realize this will be a stupid post in most people's opinion but I admit to being new to gaming and Witcher III GOTY is my first GOG purchase. What I would like to know is whether the GOTY edition includes all the DLC's as it is not mentioned in the game description?

Have a look at this post of Hickory:

https://www.gog.com/forum/the_witcher_3_wild_hunt/game_of_the_year_edition_1/post2

Thank you Max. I suppose the confusion was caused by the fact that GOG are also selling the Expansion Pass for €24.99 and as that is more than the cost of GOTY it made me believe I would need to purchase that also.