I'd say it would probably be around 14 bucks
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No. It is specifically stated on the card lore that it "cannot be Special Summoned except by paying 500 Life Points when both "Andro Sphinx" and "Sphinx Teleia" are destroyed at the same time..."
No. Destroying Pyramid of Light will only destroy Andro Sphinx and Sphinx Teleia. If you (or your opponent) destroy both sphinxes at the same time (such as through the destruction of pyramid of light), your opponent will be able to special summon Theinen the Great Sphinx, so be careful unless you have a plan to deal with that beast.
Assuming the monster doesn't have any special text which explains how to summon it, then a 10 star monster just requires two tributes, because Lv7+ monsters need two. The Earthbound Immortals and Andro Sphinx/Sphinx Teleia are Lv10 monsters that are tribute summoned as normal with just two tributes.
In the Anime terms, yes it can. Kaiba uses it to remove the three Egyptian Gods from play in the Yu-Gi-Oh! Movie. However, as we all well know, the majority of the anime is fabricated to make the game more exciting. In OCG/TCG terms, no it cannot. It's a continuous trap that allows you to Special Summon either 'Andro Sphinx' or 'Sphinx Teleia' at a cost of 500 Life Points each. When 'Pyramid Of Light' is then destroyed, the two sphinxes are also destroyed, allowing you to Special Summon 'Theinen, The Great Sphinx'. The straight forward answer is no.
its worth to much if some one knows how to get it i can get the level but i cant get gold i dont have much