Final answer:
The exact percent of bogus autographed sports memorabilia today cannot be determined without a specific, current study on the subject. The referenced national survey does not provide direct information on the authenticity of sports memorabilia.
Step-by-step explanation:
The question regarding what percent of all autographed sports memorabilia is bogus does not directly relate to the information provided by the national survey mentioned, as this survey focuses on beliefs about college sports programs and higher education corruption. Nonetheless, this question falls under the subject of Business due to its relationship with the sports memorabilia market and issues of authenticity and fraud.
To give a general insight, experts in sports memorabilia have often cited high numbers when discussing the prevalence of fake signatures in the market. It is frequently claimed in media reports that up to 50% or more of the autographed sports memorabilia could be fraudulent. However, without a specific, current study or dataset providing a percentage, we cannot give a definitive answer to the exact percent of bogus autographed sports memorabilia available today.