Street fighter II, was so wildly popular that the sequel became a brand, that is why capcom did not wanted to drop the II and move to three, but instead just keept adding ": [what ever]" in order to differenciate titles, that is why people keep buying all those, because thinking of Street Fighter II, bring all of those memories, and people while getting something new, still want that original experience somehow.
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Street fighter II, was so wildly popular that the sequel became a brand, that is why capcom did not wanted to drop the II and move to three, but instead just keept adding ": [what ever]" in order to differenciate titles, that is why people keep buying all those, because thinking of Street Fighter II, bring all of those memories, and people while getting something new, still want that original experience somehow.