The calculations the Penn state guys are using are assuming that they can take the output of an accelerator and using univented (but no doubt expensive!) technologies store and use this stuff.
Typical NASA ""science"".
Some of us are planning to use this antimatter to do real particle physics here on the ground. You know investigating the standard model and all that...not as sexy as say a mars mission but arguably much more important.
If the choices are real particle physics experimentation for 10 years, or joy rides to mars, i say we choose the former.