zezima was the first one to obtain all the skillcapes at the time but since then hundreds of people have also obtained all the skillcapes to see there names look it up in the highscores
If you go on runescape highscores, you can see that lots of people have 99 skill level in everything. Every single one of these players will have all the skill capes
yes
99k
Buy it from NPCs.
None. Skill capes are members-only items.
No, the reasone skill capes came out on runescape was to encourage " non members" to become members to get these capes making f2p players have these capes will reduce the profits they make by quite a bit for exampe.... around 10 million runescape accounts have been made, around 1 million have skill capes and about 10% would be f2p with 99's. about 8% of that 10% will pay £5 or 10$ for membership. if f2p players could have skill capes runescape would lose around 300,000 thousand pounds or 550,000 dollars. That's why F2p players don't have skill capes. Hope i answered your question.
No, free players cannot get skill capes.However, members can for 99900 coins.
I have placed a link below that should take you directly to the information you require.
Yes.
all reqular capes have the same defence stats exept ( i think skill capes ) so really any cape is good just chose the one that you like the most
No. Skill capes are only for members - even in free-to-play skills.
the last skill that was added was summoning,and as usual it is member only as most likely will all other new skills but.. runescape may decide to make some member things(like skill capes) non-members