It can actually be a major consideration when deciding what airplane to buy as well as what certificate to pursue. As a Sport Pilot you can perform preventive maintenance on a LSA which carry a Special Airworthiness Certificate but you cannot do it on the Sport Pilot eligible aircraft that carry a Standard Airworthiness Certificate such as Cubs, Champs, Taylorcrafts, Luscombes, etc. For a pilot looking to reduce the total cost of his flying and ownership experience, it is not nonsensical. It is an important consideration.