A Splash page is essentially a page that requires visitors to click to ‘enter’ the site, rather than just automatically landing on the homepage. With a splash page you give visitors more time to think about whether or not to click through to your website, and there is a chance that they can click off before they click-through to your website.
A splash can essentially waste a visitor’s time, making them work to access your website, while competitors may allow easy access, and visitors are likely to want to find content quickly, without having to jump through different hoops.
Visitors may even think that more complications exist the next few pages too, and this can certainly play a part in making them not click through to your website. Make it easy for your customers and avoid adding a splash page because it is likely t do more damage than good.