First of all, being a pure is no longer as beneficial as in the past. This is because your combat level depends on your highest combat skill, not on the sum of several skills as in the past. You might just want to train all your skills.
In any case, whether you decide to continue being a pure or train all skills, you might want to combine combat training with other skills - specifically, Slayer, and Dungeoneering. This is simply to train one more skill.
Out of most the people who pvp are pures. It really matters if your defense is good and if you have good range level and the armor helps a lot.
yes, range is really good once you get to a high lvl in it, mainly because you can not be hit, while doing damage, and range is less expensive than mage
many players enjoy it for its fun and its ability to keep their minds busy. They have also updated their graphics so now its twice as good. I personally enjoy runescape
no
Mystic armour is good and cheap
Soul wars and the mage training area.
Yews are good for training, but the time it take to cut depends on your wc level.
Chaotic Longsword > Saradomin Sword > Brackish blade/Dragon Scimitar > Rune Scimitar
If you like RuneScape, then you will find RuneScape a good and popular game.
Training you melee skills works great, but for members summoning is a good way to gain easy combat levels.
In my opinion, defence for higher levels is not that hard, but takes time. Attack and strength are good to raise. I recommend training all of them.
I just call it "RuneScape".