NEVER GIVE UP is a good slogan for countries having lot of resources, such as USA as you mentioned. Countries like India with limited resources and budget from basically taxpayers money can not afford to ave a program which has no limited time frame. You should also consider the fact that when USA was developing first mission to space, the technology was new, except Russia no country knew how to do that. It was a priority and country's pride for USA to develop indigenous technology to beat Russia. At this moment, there is no such competition. All other countries already have such missiles and there is absolutely no need to re-invent the wheel at the expense of taxpayers money.
