So you think also that the SE-spark plugs are not necessary , and that they are not better ( just a little little little bit ) ?
Better than what? Better than a kick in the balls maybe, but if you expect to see some magical performance boost to justify the big price difference you need to look elsewhere. Maybe one of those Fitch fuel catalysts.

Platinum does not produce a superior spark that unleashes additional power, no matter what some ad writer intimates. What it actually does is extend the useful life of the plug because it erodes much slower than the conventional electrode material. Less erosion means less gap growth and lower voltage requirements over time. This is what allows auto manufacturers to specify 50,000 to 100,000 mile service intervals. As for the split ground electrode, since the spark only jumps to the one with the lowest voltage requirement, it's not like you're getting two sparks for the price of one. It was a bunch of marketing hype when the Split Fire folks first started selling it years ago, and adding a little platinum doesn't make it less of a hype. If you want to "unshroud" the spark, just index the stock plugs. Or go with the ultimate unshrouded plug, a surface gap design.
If you change plugs on a yearly basis like many of us anal idiots, you will just be throwing away a lot of extra cash with the SE plugs. If on the other hand you routinely change your plugs only during engine overhauls, by all means go with the platinum or iridium plugs. I personally recommend the NGK Iridium rather than the SE for those who feel the need to upgrade.
Jerry