Why should I pay gold for sightstone.....

because you're bronze fucking 5

that's why.

Because is insufficient if the other team actively removes your wards.

https://i.gyazo.com/7e6150fa93565037e267bc8318e14361.png https://i.gyazo.com/c640825fd6a2da1066d6497a525e5133.png

You have to actually place them whether they are free or not. Vision is extremely important for preventing ganks and letting your team rotate to open objectives, and to catch them out of position. Fighting blind is a disadvantage.

You don't have to buy sightstone, but if the enemy support is intelligent and notices you didn't buy it, he's going to clear out your wards with ease and let the jungler know that your bot lane is blind to ganks.

Why should I build damage items, when everyone gets base damage for free?

Why should I build defense items, when everyone gets defensive stats for free?

It's the same concept with Sightstone. It lets you ward significantly more often than the free version, the wards last longer than the free version, and you get to deny enemy vision with the Sweeper and upgraded Sweeper, letting you take objectives safer.

Also, buy some pinks. They're basically map hacks in Bronze.

because you don't reach this limit without sightstone

well I do believe sight should give 4 and ruby 5 wards maybe theyll add them

only charges up to 2 wards. They last a significantly shorter amount of time (starting at 1 minute, going to 2min) and take a while to charge (starting at 3min, coming down to 2min). Even at 18 the 2min/2min means you can average 1 ward on the map at a time. Assuming no one takes that's 5 wards on the map at any one time. That's not nearly enough. Add on that the enemy will no doubt destroy some wards and yea, you really need more vision.

gives 3 charges upon returning to base. That means you can get 3 wards on the map at once (your limit). These wards last 150 seconds (2.5 minutes, 30 seconds longer than the best yellow trinket and two and a half times longer than the level 1 yellow ward). That's WAY more vision than you have with yellow, and allows you to swap your trinket for red to clear enemy wards as well. Ruby gives 4, which means you can actually place another ward if one is cleared or if you manage to stay out of base for more than 2.5 minutes (which almost everyone does).

Because in low elo a support can actually carry just by warding well. In high elo it's just expected

Because sometimes you need to drop 4-5 wards around an objective in a short time, and making everyone hold their trinkets is pretty bad in the time leading up to that objective.

It grants hp, and infinite wards.

Didn't you know? IT ALLOWS YOU TO GET ORACLES AND GIVE HP AND YOU DONT HAVE TO WAIT FOR CHARGES!!!!!!!!!!!!!!