95% of builds on Path of Exile scale with special uniques or powerful rares
The reason it is still fun after 20+ hours of play is because of the skill and gear progression that comes with most builds in the game. 95% of builds on PoE scale with special uniques or powerful rares as well as getting gear that has more linked sockets (5 socketed and linked sockets on gear are a lot more rare than 4 linked gear, and 6 linked gear extremely rare and endgame to acheive in most cases). Both of these will change will change how the skill works/increase their damage output significantly, making you want to progress even more to see how far you can take a build idea.
So the long and short of it is yes in it's most basic form the fun of playing the same skill over a long period is to see the returns of your investment into the skill and seeing how far you can take it, which is much more rewarding than it sounds due to the sheer complexity and number of options the game has to offer.

Dec
Buy Cheap and Safe Path of Exile Orbs on Poe4orbs.com
As Christmas Day is coming soon, now you can get 3% off dicount at our site by using the Coupon Code "POE4ORBS". The Event will last from December 20th to January 20th.

Nov
New Path of Exile league starts Friday
New league starts Friday. Hope you have a great time playing Path of Exile, but beware, you might get addicted.

Oct
Same with giving Path of Exile bosses a resolve bar
A voidheart jugg will lose some damage but not really care that hydra is poison immune, a Path of Exile chaos barrage or spectral throw will be able to kill hydra but will have to actually play the game

Jun
[3.11] PoE Harvest Templar Starter Endgame Builds
Here is the latest PoE 3.11 Harvest Templar Starter Endgame Builds - Guardian, Hierophant and Inquisitor. Whether you like cheap, fast mapping, or boss killer, you can find the build you want.
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Dec
poe4orbs:[3.9]PoE Metamorph Witch Builds (PC,PS4,Xbox,Mobile)
Welcome to the best PoE 3.9 Witch Builds brought by R4PG. Choose your favorite ascendant from Elementalist, Occultist, Necromancer and start your Metamorph journey!