This "prestige" benefit normally costs $399!
The disadvantage of course is that you are explictly allowing them to check the validity of your AMEX Platinum card, so they probably will do that, and therefore you cannot use a cancelled card.
and yes, it does cost $27 per visitor.
The DAN lounge in TLV is included
Standard Membership This low cost plan is designed for the traveler who wants the security of access when needed with a low annual fee - just US$99. After a visit to a participating lounge a fee of just US$27 per person, per visit is charged to the member’s designated payment card.
Annual Fee: US$99 Member Visit Fee: US$27 Guest Visit Fee: US$27 Standard Plus Membership This plan incorporates Standard Membership with 10 member lounge visits included - for an annual fee of just US$249. After the free visits have been used, each visit is charged at US$27 per visit to the member's designated payment card.
Annual Fee: US$249 Member Visit Fee: 10 Visits FREE - then US$27 Guest Visit Fee: US$27 Prestige Membership Designed for the frequent traveler who would prefer to make a one-off payment to gain access to lounges. For as little as US$399 free access to all the participating lounges in the program is available as often as required.
Annual Fee: US$399Member Visit Fee: All visits FREEGuest Visit Fee: US$27