AntiK I could be forgetting things, but I don't remember Wells saying when exactly he'd come get him, did he?
Wells said he would come and get them when Lois's life force re-appeared on his soul tracker *after* the date of her death.
Yes, it was vague (mostly because when I wrote it, I wasn't entirely sure of the details of L&C's return to 1993

)
Money - the effect of inflation would probably be greater the further into the future Wells went. IIRC, the show never gave any specific number of years - they just called it 'the future'.
Thanks for the comments,
Corrina.