My original point was from the perspective of a North American customer. Our pricing is different than yours, but I'll play. List price differential between the two rails in the UK is 25%. On Amazon UK, the standard rail is 59 GBP, the LR32 rail is 73 GBP, the difference is 14, the percentage difference is 24%. On the Axminster site, the TS55 without a rail is 319, with a rail is 340. If the TS55 with the LR32 rail could be purchased for 14 GBP more (354), you would still be money ahead over buying the TS55, then buying the LR32 rail (392). I mentioned I would be willing to pay $25-30 more to get the LR32 rail. 14 GBP = 21 USD. The percentage increase is 14/340 = 4.1%. I'm assuming that Festool's COGS is higher on the LR32 rail than on a standard rail.
To answer your specific question, if you have the will power after using the tracksaw to not purchase any other tools from Festool, there is no advantage to the LR32 rail. In the UK, you have the option to buy the saw with or without a standard 1400mm rail. In your case, the choice would be obvious, as it is only 20 GBP more to get the saw with the standard rail. Maybe the ideal pricing strategy would be:
1. TS 55 without a rail
2. TS 55 with a standard rail for 20 GBP more than option 1.
3. TS 55 with a LR32 rail for 34 GBP more than option 1.