Cause with eku tek you have to once off buy the licence to use there soft wear, this is a once off payment and doesnt have to be paid wen you want it remaped or tweeked, i think the figure is something like 400euro?? Traders???? i stand corrected if not.. I had the decision to make b4 and i went apexi route, for the new apexi, comander, and map i think it worked out at 300 euro more exp than getn eku tekd... so with Damo selln the 2nd hand apexi at around half the new price, it could work out even cheaper than eku.
But if you take into consideration that for mayb 300 euro extra you get the comander, which displays so much info, can do away with need to buy other monitering equipment, and apexi leaves so much more room for further modifying if you choose to some where down the line, you can use a maf sim with apexi i think and map out your maf wen you get to that power level, and so much more that the ecu tek wont be able to do if you want to go further..